31036530 has 32 divisors (see below), whose sum is σ = 85129344. Its totient is φ = 7094016.

The previous prime is 31036513. The next prime is 31036531. The reversal of 31036530 is 3563013.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 31036497 and 31036506.

It is not an unprimeable number, because it can be changed into a prime (31036531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73687 + ... + 74106.

It is an arithmetic number, because the mean of its divisors is an integer number (2660292).

Almost surely, 2^31036530 is an apocalyptic number.

31036530 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31036530 is an abundant number, since it is smaller than the sum of its proper divisors (54092814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31036530 is a wasteful number, since it uses less digits than its factorization.

31036530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147810.

The product of its (nonzero) digits is 810, while the sum is 21.

The square root of 31036530 is about 5571.0438878185. The cubic root of 31036530 is about 314.2614088839.

Adding to 31036530 its reverse (3563013), we get a palindrome (34599543).

The spelling of 31036530 in words is "thirty-one million, thirty-six thousand, five hundred thirty".